Joseph Parker believes All Blacks star Sonny Bill Williams will return to boxing one day, and he also stated his own upcoming fight against Anthony Joshua will put New Zealand "in the history books".

Williams has boxed professionally in the past and even won the New Zealand heavyweight title in 2012. He currently holds an undefeated 7-0 record but hasn't fought since his victory over Chauncy Welliver in Jan. 2015.

In a fight which is expected to fill out the 74,500-seater arena, the New Zealander believes the bout will attract global appeal and help to give his nation more worldwide recognition.

While Parker acknowledged rugby will continue to be New Zealand's national sport, he believes interest in boxing is growing in the country and revealed that some of the All Blacks may attend his fight despite the mammoth 18,891 km distance between capital city Wellington and Wales' Cardiff.

"I think some of the players might be free and might come over," Parker added. "I'm good friends with Jerome Kaino, Israel Dagg, Sonny Bill. I think if some of them do get time off they'll definitely come over and support.

"This is a fight where I think the whole of New Zealand are going to back us, and it can be a fight where we do well. It's going to put New Zealand boxing on the map and it's going to put us in the history books.

"As our team, we love a challenge. We love the challenge over fighting overseas. We love the challenge of fighting infront of 80,000 people so it's going to be an experience that everyone's going to come along for the ride and enjoy."